scoria (n.)
- alluvion
- alluvium
- ash
- ashes
- basalt
- bedrock
- brand
- breccia
- calx
- carbon
- charcoal
- cinder
- clinker
- coal
- coke
- conglomerate
- crag
- deposition
- dregs
- dross
- ember
- feces
- froth
- fume
- gneiss
- granite
- grounds
- lava
- lees
- limestone
- loess
- magma
- monolith
- moraine
- pahoehoe
- porphyry
- precipitate
- precipitation
- reek
- rock
- rubble
- sandstone
- schist
- scree
- scum
- sediment
- settlings
- silt
- slag
- smoke
- smudge
- smut
- soot
- stone
- sublimate
- talus
- tufa
- tuff
